<div class="p-extension">
  <div class="p-extension-frame">
    <div class="p-extension-scroll">
      <div class="p-extension-content"></div>
    </div>
  </div>
  <div class="p-extension-button">
    <img class="p-extension-front" src="/asset/img/B1.png">
    <img class="p-extension-back" src="/asset/img/B2.png">
  </div>
</div>